Jason Gaviati, a musician who had worked with many of your favorite stars, has passed away. (He was better known by the name "Gavi.") Although the musician had been struggling with cancer, he was in remission when he was rushed to the ER after difficulty breathing. Sadly, he passed away over the weekend.

Lindsey Sterling wrote a heartbreaking message about his passing.

"This is so hard to say but Gavi passed away today. I am in shock and my heart is broken. I don't understand. He was cancer free and home and now he's gone. He was my best friend and the most optimistic person I've ever met," she wrote.

"When I think of him, I will always imagine him laughing because that's what Gavi was the best at; making people laugh and spreading joy. I love you Gavi. I love you more than you will ever know."

Alyston Stoner was shocked by the news.

And Cassadee Pope says that he changed her life.

Jack Barat from All Time Low paid his respects on Twitter.

And so did Sean Mackin from Yellowcard.

Through his work, he had collaborated with stars like Sydney Sierota from Echosmith and Melanie Martinez, and was definitely beloved.

Our thoughts go out to Gavi's loved ones. Send your kind words to Gavi's friends and family in the comments.